PH Tool products

The machining of flat bottom holes constitutes a large part of what we are known for at PH Tool™. These holes appear in many test blocks such as ASTM reference blocks made to E127 and E428, and many other block types as well. In addition, countless application-specific standards employ the use of flat bottom holes at various depths and diameters. They simply make for excellent ultrasonic inspection targets with very predictable and quantifiable dimensions. We take many steps at PH Tool to ensure that you get a drilled flat bottom hole of the highest quality available. We employ both conventional machining (drilling) and nonconventional (EDM) machining in the hole-making process. The determining factors we consider in choosing a method are machinability of the workpiece, accessibility, hole diameter and depth.  Most FBHs are drilled in the range of 0.250” (6.25mm) diameter and under.